Method and Apparatus for making more efficient use of air link resources and network capacity in a mobile telecommunications system in which unauthorized and/or unsupported media types transmitted in a session initialization protocol (SIP) message sent from one equipment user (UE) to another are deleted...http://www.google.com.au/patents/US7218626?utm_source=gb-gplus-sharePatent US7218626 - System and method for reducing information communicated between universal mobile telecommunication system multimedia capable units
